<!DOCTYPE html>
<html>
  <head>
    <title>Test advertised required document policy</title>
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>  </head>
  <body>
    <h1>Test advertised required document policy</h1>
<script>
// The top-level document has a required document policy. Any requests for
// documents in child frames must be sent with a required policy header
// indicating a required policy at least as strict. (In this case, "at least as
// strict" means that the 'bpp' parameter must be less than or equal to the
// parent document's required value.)

callbacks = {};

window.addEventListener('message', ev => {
  var id = ev.data.id;
  if (id && callbacks[id]) {
    callbacks[id](ev.data.requiredPolicy || null);
  }
});

async_test(t => {
  var iframe = document.createElement('iframe');
  iframe.src = "/document-policy/echo-policy.py?id=1";
  callbacks["1"] = t.step_func_done(result => {
    assert_equals(result, "lossless-images-max-bpp=1.1");
  });
  document.body.appendChild(iframe);
}, "Child frame with no explicit policy should have the same required policy as its parent.");

async_test(t => {
  var iframe = document.createElement('iframe');
  iframe.src = "/document-policy/echo-policy.py?id=2";
  iframe.policy = "lossless-images-max-bpp=4";
  callbacks["2"] = t.step_func_done(result => {
    assert_equals(result, "lossless-images-max-bpp=1.1");
  });
  document.body.appendChild(iframe);
}, "Child frame with a less strict required policy should have the stricter value from the parent's policy applied.");

async_test(t => {
  var iframe = document.createElement('iframe');
  iframe.src = "/document-policy/echo-policy.py?id=3";
  iframe.policy = "lossless-images-max-bpp=1.0";
  callbacks["3"] = t.step_func_done(result => {
    assert_equals(result, "lossless-images-max-bpp=1.0");
  });
  document.body.appendChild(iframe);
}, "Child frame may have a stricter policy than the parent.");

async_test(t => {
  var iframe = document.createElement('iframe');
  iframe.src = "/document-policy/echo-policy.py?id=4";
  iframe.policy = "font-display-late-swap=?0";
  callbacks["4"] = t.step_func_done(result => {
    assert_equals(result, "font-display-late-swap=?0, lossless-images-max-bpp=1.1");
  });
  document.body.appendChild(iframe);
}, "Any unrelated policy directives should combine with the parent's required policy.");
    </script>
  </body>
</html>
